PowerEdge SC1420 won't boot

It looks like that when the computer is off, the A diagnostic light is yellow.

Turning on the computer causes the B light to come on and the power button to flash yellow.

I replaced the CMOS battery and the power supply.

Same thing

Any thoughts?
Sheldon LivingstonConsultantAsked:
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IKtechCommented:
first of all remove everything that is connected to the motherboard like drives expansion cards, etc...  Also try to remove connections to CPU fans too and see if the result changes (Don't leave the machine on for very long without the fan plugged in!!!!!!!)

will it POST?  If yes one of the devices you removed is faulty.  Readd one at a time until problem returns.  The most recently added device is the culprit.

If no POST, try removing one stick of memory at a time and try to isolate the problem to a memory stick.

If still no post after moving RAM around.  I would guess you have a bad MB or CPU.  Do you have another processor you can try
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Jeff PerryWindows AdministratorCommented:
According to the following link you may have faulty hardware.

Look at Table 2-1 here.

http://support.feelpcs.com/pc-spec/PowerEdgeSC1420/it/t2799c20.htm
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Sheldon LivingstonConsultantAuthor Commented:
IKtech... still no joy.  Don't have another processor.

So, I guess the flashing B indicator and power button can mean a bad PSU or MB...
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IKtechCommented:
the flashing power button can mean a variety of things.  Most common are memory and PSU.  So if you have ruled those out i would think it is the MB or the CPU.  Can you see any visable damage to the motherboard like swollen or bursting Capacitors or perhaps a melted chip.

You could try to reseat the processor.
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Sheldon LivingstonConsultantAuthor Commented:
MB looks good... this happened when the power company shut off power for 4 hours.
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IKtechCommented:
ahh and you replaced the cmos battery?


Having replaced the CMOS battery, verify the BIOS settings for what to do after a power failure (usual options are "off", "last state" and "on" -- You probably want "on").

Is there a jumper to clear cmos,  That might be worth a try

http://www.manualslib.com/manual/37025/Dell-Power-Edge-Sc1430.html?page=118
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Sheldon LivingstonConsultantAuthor Commented:
IKtech... well, tried the cmos jumper to no avail.

Replaced the cmos battery with a new one as well.

Losing the server isn't so bad except that it is an Exchange server and we'd want the old email...
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Sheldon LivingstonConsultantAuthor Commented:
I think that I have demonstarted that the MB is the issue...

Thanks.
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Jeff PerryWindows AdministratorCommented:
I know you marked this question as answered but all the troubleshooting steps you took were a waste of time.

If you had followed the table I pointed you to you would have seen that:

The "A" diagnostic light being yellow with the system off and power applied is a normal state.

When you power the system on and receive the yellow light on the "B" diagnostic indicator it clearly states that you have a power issue. Whether it is in the PSU or MB is moot.

You are welcome.
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